Hellebyuck has been hiding a lot of problems in the roster for years. When you lead the league in SV%, GAA and SOs you can get away with a lot. Since he's been out for a decent chunk of games so far this year it's exposed a lot of their weaknesses.
It's similar to Demko and the Canucks of the last few years, having a top calibre goaltender makes you look better than you should and if management gets fooled into thinking the same thing you end up in this situation.